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Anonymous

Re: I have a micromega stage 5 and the disc is jittering...

Had the same problem I think. When I would load a disc after a few seconds the unit would read no disc. I opened the unit and removed the transport and there is a board under the laser unit, on that board there is an adjustable pot so I plugged the module to the main board and powered the unit up. I adjusted the pot then sat a cd on it until I found a setting that worked. I hope this helps. I am not sure of your ability. Something to remmember is you can only fix it or break it.

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First; try blowing into the DVD reader, sometimes it is just a hair. also try a DVD cleaner disc. Check if the drive spins up correctly, and "listen". If it's spnning but having trouble reading you will hear a whizzing sound as it tries different speeds.

stretched belt or needs lube, those are the easiest things, with the unit on, remove the disc so you can get to the belt, take it off the motor and see if the RPM's increase a lot, lube the center spindle with a light oil, and check for easy spinning ,, replace the belt, and turn the disc back and forth, if you see slippage or a binding in the belt, ( like a little loop wanting to develop) replace the belt, if the belt seems to be just slipping, clean all the contact points of the b elt with rubbing alcohol

What's probably wrong is that the player's optical assembly isn't working. If the lens is very dirty or the laser power gets too weak, the player doesn't detect the disc. The player has to see the disc is there before it starts spinning. You can try cleaning the lens with a cotton swab and lens cleaning fluid, but if the trouble continues then the pickup should be replaced.

Your no disc error can be a DIY like the
following steps.Assuming that the disc is good.1.Clean the lens.-
Sometimes because of dust the lens can't read any disc. Try clean the lens by
soft cotton buds. Be careful while doing this.

I've suspect that the lens is filled up with dust. Below is just for your guide.2.Replace the ribbon- Check
the ribbon connected to the lens from the main board forscratch,
damage. Once it has an open line then of course the lens can't read the
disc. Also try to erase the contact by pencil eraser. If you've done the steps
above and the symptoms still there then the next step requires you a little
knowledge in soldering technique and reading the ohmmeter.3.Check the motor- Check
the motor that spin the disc with an ohmmeter. You can test it using the
ohmmeter (x1) even it is connected on the lens assembly.Good
motor- reading should be fairly high and it will spin.Bad
motor- reading will drop to low resistance and will not spin.Hint :50% of my
repaired unit the above parts are commonly caused of the problem.If you confirmed that you have a defective motor
then replace it with a new one. Before replacing the new motor you have to
check the clearance of the disc holder with the old one. The clearance should
be the same as the old because if not the lens will not read the disc if it is
too far or too close.Ifyou already cleaned the lens, and confirmed that
the ribbon is good as well as the motor then I've advice you to send it to
repair shop because the next step should be done with an expert because it is
quite technical diagnosing the fault between the pick-up lens and the main
board.

It is the chrome rails bars grease that's hardened already causing to jump the disc. Due to accumulated dust and dirt to the grease.Just take out the old grease with an alcohol and change it with a type-A grease,only put a little amount... Manually cleaning the lensTo locate the laser lens, look
around the door or drawer of the DVD player and you will see a small circular
disc, which is often called the turntable or disc platter. Right off the edge
of the platter you should see a small clear lens. There are some manufacturers
that have had problems with the lens, depending on the age of the unit. In
these problem players, moving the unit to a different location, turning the
unit upside down, or sometimes even without moving the unit, the lens can
become detached from the laser assembly and floats around inside the unit. You
can re-glue it back with a little crazy glue, BUT it must be perfectly
centered, and without getting any glue on it. So, if you don’t see the plastic
lens, but instead see the laser pick-up assembly, look around for the lens
inside the unit and glue it back on. To clean the lens you must use very
little pressure. Take a cotton swab and barely moisten it with plain,
non-scented, or oily type alcohol. In a swirling motion, very gently rub the
lens until you’ve covered it entirely. Then repeat using the dry end.
If the cleaning didn’t help, don’t despair just yet. You can see if there’s
a problem elsewhere in the unit by using a few simple tricks and tips.
First thing you want to see if the unit’s laser is in good working order.
This method isn’t foolproof, but most of the time works admirably. When you
insert a disc, see if you can look up underneath where the disc sits on the
turntable. Observe the laser lens going up and down. If the lens is trying to
focus, that’s good! After a few seconds of the lens trying to focus, the
platter should start to spin. On almost every CD/DVD unit I've encountered, the
unit won't spin unless the laser has properly focused on the surface of the
disc. If the unit spins up and and then shuts down, you should check and make
sure the laser pick-up assembly slider mechanism is working without any
obstructions and that the small chrome rail that it slides on is slightly
greased. Don’t go overboard with the grease though, as too much can cause all
sorts of problems.
The slider mechanism, depending on the age of the unit and the manufacturer,
consists of the small chrome rail, a drive motor, a small gear assembly, and
(in some units) a small belt that drives the slider unit via the motor. This
small belt causes all sorts of problems. If the belt is broken or slipping, it
can cause skipping, dropouts, or simply no start up at all. Also, if the belt
breaks in the middle of the disc, the drive mechanism gets hair or dirt wrapped
up into the gears, or the pick-up assembly doesn’t return to the start position
(called home), the unit will (99% of the time) refuse to release the disc, causing
it to become stuck inside the unit. There’s a little micro or leaf type switch
located at home position that sometimes gets dirty or breaks and, causing this
problem also.
If the disc starts to spin slowly and doesn’t come up to speed, the spindle
motor that’s attached to the turntable platter is a common problem. There could
also be a problem with the spindle motor driver controller IC or the power
supply regulator that supplies voltage to the driver IC. If the disc starts to
spin and then spins really fast, or stops and starts to spin backwards, your
problem is the laser pick-up assembly or the servo control circuit. If you
continue to have problems after cleaning and checking the other things listed
above, you may have a problem with the player's alignment. Of course, one of
the problems you'll face checking alignments on a DVD/CD player is that you’re
going to need to use an oscilloscope on most of them. If you have the proper
tools and equipment, the first thing to look at is the RF pattern of the unit
while its playing. It should be a sharp and clear pattern. If it's dull and
smeared, then the laser could be weak.
Also, in these units are very critical alignments called the focus/tracking
gains and offsets. When these alignments are off, it can often cause
intermittent troubles. As the unit ages and parts change value, so do these
alignments, and will need to be checked. In my time as service technician
repairing DVD/CD players, 65% of the laser pick-up assembles I have tested were
good and only needed a small adjustment. Today's technology makes it unfeasible
for a shop to hook up a DVD/CD player, and even some recorders, to their
equipment and make these adjustments because of the cost involved.